from sklearn.preprocessing import StandardScaler


def stad():
    """

    :return:
    """
    std = StandardScaler();
    data = std.fit_transform([[1,-1,3],[2,4,2],[4,6,-1]])
    """
    [[-1.06904497 -1.35873244  0.98058068]
    [-0.26726124  0.33968311  0.39223227]
    [ 1.33630621  1.01904933 -1.37281295]]
    """
    print(data)
    return None
if __name__ =='__main__':
    stad()